Slip



Dec. 15, 1931.

J. D, NIXON 1,836,680

SLIP I Filed Sept. 15, 1950 2 Sheets-Sheet 1 duommqd Patented Dec. 15,1931 UNITED STATES JEDDY D. NIXON, OF HOUSTON, TEXAS SLIP Applicationfiled September 15, 1930. Serial No. 482,042.

This invention relates to a novel type of scribed in which the jaws areso assembled in the carrier that the jaws will assume the weight of theload carried by the slip and the carrier will be relieved of the weightof such load. 9) A still further feature of the invention resides in theprovision of a slip of the character described, wherein the jaws-are soassembled with the carrier that in case of break- ,age of the jaws theparts will be held in 35 the carrier without liability of dropping intothe hole and the assembly is of such construction that the jaws may bereadily assembled with the carrier and retained therein againstdispacement therefrom but may be readily removed in case of breakage orwear and replaced with new ones. It is still another object of theinvention to provide a slip whose parts may be assembled and maintainedin assembled relation without the use of bolts or nuts or other partsthat are liable to become broken, lost or displaced in use.

The slip is also of such construction that it may be engaged about apipe having different 49 outside diameters by suitably adjusting theslip in the seat provided therefor in the rotary table or other support.

With the above and other objects in view the invention has particularrelation to cer- 5 tain novel features of construction, operation andarrangement of parts, and use, an example of which is given in thisspecification and illustrated in the accompanying drawings, wherein:Figure 1 shows an inside elevational view of one section of the sliplocated in a rotary table seat, and

Figure 2 shows a plan view thereof, showing one section of the slip insection, taken on the line 22 of Figure 1.

Referring now more particularly to the drawings wherein like numerals'ofreference designate similar parts in each of the figures, the numerals1, 1 designate confronting sections of the carrier. Each section isarcuate in cross sectional contour and the external surface of thecarrier sections tapers downwardly to conform to the pitch of the seat 2of the rotary table or other support 8. The lower end of the carriersections is inwardly beveled, as at 4, to readily seat in said seat. I

Each carrier section has a plurality of radially extending slots as 5extending vertically therein, forming jaw bearings and at the respectiveends of said slots the carrier has the upper and lower inwardlyextending arcuate shoulders 6. 7, in alignment with the upper and lowerends respectively of said slots.

There are the pipe engaging aws 8 which work radially through therespective slots 5 and. extend vertically substantially from end to'endof said slots. The inner edges of the respective jaws are widenedpresent 5%} ing the toothed arcuate faces 9 to the pipe 10 to be heldand these pipe engaging faces engage said pipe uniformly all the way.around so as to preventthe pipe from becoming distorted or misshapen bythe slip.

In assembly the jaws are inserted through the slots 5 from insideoutwardly and said jaws are retained in the carrier, sections by meansof the vertical side ribs 11 which are welded to the outer margins ofthejaws, J one on each side.

Adjacent each side of each slot 5 the carrier sections are provided withthe external vertical grooves 12 which are substantially g5 coextensivein length with the ribs 11 and in which said ribs seat when the jaws aremoved inwardly into their inner positions. The widened inner margins ofsaid jaws en gage the inner side of the corresponding subjected to theweight of the load. Each section of the slip may be handled independentof the other section through the U- shaped handle 13. The upper end ofeach section of the carrier has the transverse spaced, bearing grooves14 extended therein inwardly from the outer periphery thereof andbearings 15 of the corresponding handle 13, are i tted into said groovesand pinned therein by means of the bearing pins 16 which are fitted intothe keyways 17, provided for that purpose, and extending through saidhandle bearings. These pins may be retained in place by the annularabutments 18 welded around the wall of the corresponding key waysadjacent the outer ends of said pins. If it be desired to remove ahandle 13 the abutments 18 may be readily drilled out and the pins 16removed.

In case a jaw should become broken, the parts thereof will be retainedassembled with the carrier and will not be liable to drop out and dropinto the bore. If it be desired to remove a broken jaw or a worn jaw thecorresponding ribs 11 may be readily removed by any approved process andsaid parts removed and replaced with new ones.

t will be observed that the jaws 8 havea considerable range of radialmovement with respect to the carrier so that in handling a pipe such asa drill stem, a slip of suitable size for engaging the-stem between thecouplings ortool joints may be used and this slip will also be suitablefor engaging around the tool joints or drill collar of largerdiameterthan the ordinary stem sec tions by suitable adjustment of theslip in the tapering seat 2.

The drawings and descriptions disclose what is now considered to be apreferred form of the invention by way of illustration only while thebroad principle of the invention will be defined by the appended claims.7

WhatI claim is 1. A slip formed of sections, each section being composedof a one piece carrier having spaced radial slots, and pipe engagingjaws radially movable in said slots and having their inner marginwidened.

2.-A slip formed of sections, each section comprising a carrier arcuatein horizontal cross-sectional contour and having radial, verticallyextending slots, spaced apart therearound, andpipe engaging jawsworking.

radially through said slots and having stops to limit their inwardmovement.

3. A slip formed of sections, each section comprising a carrier havingspaced radial slots, and pipe engaging aws radially movable in saidslots and having their inner margins widened, and means forindependently moving said respective sections.

4. Aslip for holding pipe and the like, including confronting, arcuate,carrier sections, each section having radial, vertically extending slotsspaced apart and forming jaw bearings, jaws shaped to work snuglythrough said bearings and whose inner margins are widened and haveengaging teeth.

5. A slip for holding pipe and the like, in-

T eluding confronting, arcuate, carrier sections,

each section having radial, vertically extending slots spaced apart andforming jaw bearings, jaws shaped to work snugly through said bearingsandwhose inner margins have engaging teeth, and inner and outerabutments on the jaws to limit the outward and inward radial movement. v

6. A slip for pipe, andthe like, and formed of sections, each sectioncomprising a carrier section arcuate in cross sectional contour andprovided with radial, vertically extending slots forming jaw bearings,jaws shaped to fit snugly through said bearings, the inner margins ofsaid jaws being widened and presenting toothed bearing faces to the pipeto be held, and abutments at the outer margins of the jaws which limitthe inward movement of said jaws.

7. In aslip for holding pipe and the like a carrier section, arcuate inhorizontal cross sectional contour, and having radial,verticallyextending slots, forming jaw bearings, jaws workingthroughsaid bearings whose inner margins are widened and formed withtoothed, pipe-engaging faces, and external abut-ments at the outermargins of said jaws whichlimit the inner movement of the jaws relativeto the carrier. 7

8. In a slip a carrier section, pipe engaging jaws therein, the upperend of said section having spaced bearings, a handle whose ends fit intosaid bearings, said section having in- .wardly extending keywaystransversely of said bearings, pins in said keyways extending throughsaid handle ends, and abutments welded to the walls of the keyways adjacentthe outer ends of said pins.

In testimony whereof I have signed my name to this'specification. v

JEDDY D; NIXON.

